Cluster headaches are a rare type of severe headache.
The main symptom of a cluster headache is attacks of severe pain in 1 side of your head, often felt around your eye.
The exact cause of cluster headaches is unclear. They can sometimes be triggered by alcohol or strong smells like perfume, paint or petrol.
The main treatments for cluster headaches are injections or nasal sprays that you use soon after a headache starts.
You can help prevent cluster headaches by avoiding things that trigger them. Doctors can also prescribe medicine to help prevent attacks.
Page last reviewed: 22/05/2017
Next review due: 22/05/2020